eli5: with social security numbers you only have 9 digits to choose from and only so many number orders to choose from. How do no 2 people have the same order of numbers?

Question

eli5: with social security numbers you only have 9 digits to choose from and only so many number orders to choose from. How do no 2 people have the same order of numbers?

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Answer 1

Social Security numbers aren’t chosen; they’re assigned. The Social Security Administration ensures the numbers are unique.